Could not connect to bootloader

[zyxzxy]

hi,
I ran into some problems when I tried to flash code into crazyflie2.1 using crazyradio 2.0.

(c-env) zyx@zyx:~/nanoflow/crazyflie-optical-flow-obstacle-avoidance-app-main/app_obstacle_avoidance$ make clean platform=cf2
make KBUILD_OUTPUT=/home/zyx/nanoflow/crazyflie-optical-flow-obstacle-avoidance-app-main/app_obstacle_avoidance/build -C ../crazyflie-firmware OOT=/home/zyx/nanoflow/crazyflie-optical-flow-obstacle-avoidance-app-main/app_obstacle_avoidance EXTRA_CFLAGS= clean
make[1]: Entering directory '/home/zyx/nanoflow/crazyflie-optical-flow-obstacle-avoidance-app-main/crazyflie-firmware'
make[2]: Entering directory '/home/zyx/nanoflow/crazyflie-optical-flow-obstacle-avoidance-app-main/app_obstacle_avoidance/build'
  CLEAN
make[2]: Leaving directory '/home/zyx/nanoflow/crazyflie-optical-flow-obstacle-avoidance-app-main/app_obstacle_avoidance/build'
make[1]: Leaving directory '/home/zyx/nanoflow/crazyflie-optical-flow-obstacle-avoidance-app-main/crazyflie-firmware'


(c-env) zyx@zyx:~/nanoflow/crazyflie-optical-flow-obstacle-avoidance-app-main/app_obstacle_avoidance$ make cload
make KBUILD_OUTPUT=/home/zyx/nanoflow/crazyflie-optical-flow-obstacle-avoidance-app-main/app_obstacle_avoidance/build -C ../crazyflie-firmware OOT=/home/zyx/nanoflow/crazyflie-optical-flow-obstacle-avoidance-app-main/app_obstacle_avoidance EXTRA_CFLAGS= cload
make[1]: Entering directory '/home/zyx/nanoflow/crazyflie-optical-flow-obstacle-avoidance-app-main/crazyflie-firmware'
tools/kbuild/Makefile.kbuild:147: warning: overriding recipe for target 'cload'
Makefile:137: warning: ignoring old recipe for target 'cload'
make[2]: Entering directory '/home/zyx/nanoflow/crazyflie-optical-flow-obstacle-avoidance-app-main/app_obstacle_avoidance/build'
python3 -m cfloader  flash  cf2.bin stm32-fw
Restart the Crazyflie you want to bootload in the next
 10 seconds ...
Failed to flash: Could not connect to bootloader
make[2]: *** [/home/zyx/nanoflow/crazyflie-optical-flow-obstacle-avoidance-app-main/crazyflie-firmware/Makefile:137: cload] Error 255
make[2]: Leaving directory '/home/zyx/nanoflow/crazyflie-optical-flow-obstacle-avoidance-app-main/app_obstacle_avoidance/build'
make[1]: *** [tools/kbuild/Makefile.kbuild:150: sub-make] Error 2
make[1]: Leaving directory '/home/zyx/nanoflow/crazyflie-optical-flow-obstacle-avoidance-app-main/crazyflie-firmware'
make: *** [../crazyflie-firmware/tools/make/oot.mk:29: cload] Error 2

How to solve this problem?I've put the drone into bootloader mode.
Looking forward to your reply.
Best wishes.

[ToveRumar]

Hi!

Ok, this looks strange. Lets find out the issue!
I just want to double check some things;

• Looking at your drone. Are the blue LEDs indicating it is in bootloader mode (blinking slowly, no other LEDs on)?
• If you use the cfclient, can you connect to the bootloader using the gui?
  (connect->bootloader->Cold boot (Recovery)->Initiate bootloader cold boot)

[zyxzxy]

Thank you for your reply. Here is a video of me in action. I can't actually connect to the client in bootloader mode.

[zyxzxy]

[ataffanel]

Hi, your blue LED is blinking fast which mean that you are currently in USB DFU recovery mode and not in bootloader mode. You should press the power button until the LED starts blinking and then release it right away, you will then be in bootloader mode. If you keep is pressed until the LED blinks faster, you will be in USB DFU recovery mode (the STM32 is put in DFU mode, this is intended as a last resort recovery mode).